PHASE-CORRECTING FEEDBACK-SYSTEM FOR CLASS E POWER-AMPLIFIER

A phase-correcting feedback system which reduces the AM-to-PM distorti on of Class E power amplifiers for wireless communication is presented in this paper, It comprises a novel limiting amplifier, a phase detec tor, and a phase shifter all operating at 835 MHz. The phase-correctin g feedback together with a Class E power amplifier were fabricated in a 0.8-mu m GaAs MESFET process, The limiting amplifier has a phase err or less than 2.5 degrees. The phase detector and phase shifter have a sensitivity of 10 mV/degree and 80 degrees/V, respectively, The Class E power amplifier delivers 26.5 dBm to the load with a power added eff iciency of 67%, The phase correcting feedback system reduces the 30 de grees phase distortion of the Class E amplifier down to 4 degrees, and its total power dissipation is 21.5 mW.